Endless
You have a greenhouse that is endless. Imagine your endless greenhouse, which goes on and on, as far as the eye can see. Lucky you.
What will you grow in your endless greenhouse? Imagine all your favourite flowers and foods growing endlessly in your endless greenhouse.
ばく
None
None
Your flowers have grown so big that now the only way you can fit into your endless greenhouse is by lying on your back (ばく).
Imagine yourself lying on your back in your greenhouse under a canopy of great big flowers, tending to them as they grow even bigger.